Question about rear door panels

[ls1nova71]

My reuck didnt come with rear door panels originally but I have a pretty nice pair I was going to use on it. So today before I started painting the tub, I mounted all the stand offs then put one panel on to see how it fit. The front fits great, but the back is horrible. The panels are a little warped in back, but im a full half inch short? The bottom just barely touches the lower bracket, so no way to put the screws in, and also I have a gap at the back of the wheel well. If I put the upper chrome strip at an angle, down in the back the gap goes away, but then the chrome strip looks funny, not to mention there is no way to screw it to the bedside that way. Anybody else ran into this? Not sure if I made new cardboard pieces for the back that weren't warped if that would help? Anyone ever replaced the cardboard backs?